專案中有時候需要為View繫結資料，比如每一個雲標籤都對應伺服器一個標籤id，View中setTag可以方便的為控制元件繫結資料。

為控制元件繫結資料：

selectCategory.setTag(R.id.tag_id, id);
selectCategory.setTag(R.id.tag_type, type);

Object object=selectCategory.getTag(R.id.tag_id);
if(object!=null&& object instanceof Integer){
    ...

/**
 
 * Sets a tag associated with this view and a key. A tag can be used
 * to mark a view in its hierarchy and does not have to be unique within
 * the hierarchy. Tags can also be used to store data within a view
 * without resorting to another data structure.
 *
 * The specified key should be an id declared in the resources of the
 
 * application to ensure it is unique (see the <a * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>).
 * Keys identified as belonging to
 * the Android framework or not associated with any package will cause
 * an {@link IllegalArgumentException} to be thrown.
 
 *
 * @param key The key identifying the tag
 * @param tag An Object to tag the view with
 *
 * @throws IllegalArgumentException If they specified key is not valid
 *
 * @see #setTag(Object)
 * @see #getTag(int)
 */
public void setTag(int key, final Object tag) {
    // If the package id is 0x00 or 0x01, it's either an undefined package
    // or a framework id
if ((key >>> 24) < 2) {
        throw new IllegalArgumentException("The key must be an application-specific "
+ "resource id.");
    }

    setKeyedTag(key, tag);
}

如可在string.xml中設定兩個常量

<item name="tag_id" type="id"></item>
<item name="tag_type" type="id"></item>